The book stressed to rotate your hips while keeping your shoulders stable and looking ahead. Recently I saw several Youtubes on chirunning (or maybe just similar) where they stressed rotating your shoulders *slightly* (without crossing your mid-line with your hands) to balance the rotation of your hips as well as assisting your hips, etc. to move forward, especially late in a run or race, if not all the time. I will be interested to hear your comments.

Sorry for the delayed reply. In short - focus on keeping your shoulders relaxed and aligned, allowing your arms to swing with emphasis to the rear. Don’t let your elbows come in front of your hips. Keeping the upper body aligned (shoulders over hips) and arms relaxed will ALLOW that pelvic rotation to happen. You might want to check out the Chi Running app ($10, iPhone; Android coming soon) - it has more up to date information and great video lessons!